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Thunbergia grandiflora

Thunbergia grandiflora, Photo: Randolph Femmer /NBII.Gov

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Lamiales

Familia: Acanthaceae
Subfamilia: Thunbergioideae
Tribus: Thunbergieae
Genus: Thunbergia
Subgenus: T. subg. Hexacentris
Species: Thunbergia grandiflora
Varietas: T. g. var. axillaris

Thunbergia grandiflora (Roxb. ex Rottler) Roxb., 1820.

Type locality: witout date, India.
Lectotype: Roxburgh, in Ker Gawler, Bot. Reg. 6: t. 495. 1820). Lectotypified by Kartesz & Gandhi, Phytologia 71: 89. 1991.


Flemingia grandiflora Roxb. ex Rottl.
Flemingia racemosa Herb. Madr. ex Wall.
Pleuremidis grandiflora Raf.
Thunbergia chinensis Merrill
Thunbergia cordifolia Nees
Thunbergia malvifolia Buch.-Ham. ex Wall.
Thunbergia talbotiae S. Moore

Native distribution areas:

Continental: Asie
China (Guangdong, Guangxi, Hainan, Fujian), India (throughout), Bhutan, Sikkim, Darjeeling, Bengal, Vietnam, Laos, Myanmar [Burma] (Bago, Mandalay, Yangon)

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

Thunbergia grandiflora

Thunbergia grandiflora


Roxburgh, W. in Ker Gawler, J.B. 1820. Botanical Register; Consisting of Coloured Figures of Exotic Plants Cultivated in British Gardens; with their History and Mode of Treatment. London 6: t. 495. 1820 (Hort. bengal. 45. 1814, nom. nud.)


Hassler, M. 2018. Thunbergia grandiflora. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: 2018 Jun. 27. Reference page.
International Plant Names Index. 2018. Thunbergia grandiflora. Published online. Accessed: Jun. 27 2018.
The Plant List 2013. Thunbergia grandiflora in The Plant List Version 1.1. Published on the internet. Accessed: 2018 Jun. 27. 2018. Thunbergia grandiflora. Missouri Botanical Garden. Published on the internet. Accessed: 2018 Jun. 27.
USDA, ARS, Germplasm Resources Information Network. Thunbergia grandiflora in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
Deutsch: Großblütige Thunbergia
English: clockvine, blue sky vine, Bengal clock vine, Bengal trumpet, blue trumpet vine
español: Brisa de la mañana, Corona del rey
suomi: Kellosusanna
Nederlands: grootbloemige thunbergia
русский: Тунбергия крупноцветковая

Thunbergia grandiflora is an evergreen vine in the family Acanthaceae.[2] It is native to China, India, Nepal, Bangladesh, Indochina and Myanmar and widely naturalised elsewhere.[3] Common names include Bengal clockvine, Bengal trumpet, blue skyflower, blue thunbergia, blue trumpetvine, clockvine, skyflower and skyvine.[3]


Plants may grow to about 20 metres in height and have a long root system with a deep tap root.[2] The stalked, opposite leaves, which have a rough surface, are quite variable in shape. They may be triangular or ovate and the margins may be toothed, lobed or entire. Length is up to 200 mm and width is up to 60 mm,[2] which are typically smaller than the very similar T. laurifolia.

The blue to mauve flowers are about 8 cm across with a 4 cm long tube that is pale yellow inside.[2] These are followed by pods containing seeds that are ejected several metres upon ripening. Plants also reproduce from segments that are washed down watercourses.[2]

With a minimum temperature of 10–13 °C (50–55 °F), this plant is cultivated as a houseplant in temperate regions,[4] and has gained the Royal Horticultural Society's Award of Garden Merit.[5][6]

The species has become a serious environmental weed in Australia on disturbed land along watercourses and in the wet tropics where it smothers other vegetation. It is commonly seen north of Sydney where it has been cultivated for many years.[2]

"Thunbergia grandiflora". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government, Canberra. Retrieved 8 January 2013.
"Thunbergia grandiflora". Weeds Australia - Profiles. Retrieved 17 April 2021.
"Thunbergia grandiflora". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 8 January 2013.
RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 978-1405332965.
"RHS Plant Selector - Thunbergia grandiflora". RHS. Retrieved 5 March 2021.
"AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 102. Retrieved 23 December 2018.

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